Move UTF-8 encoding to shared code

This will be used by the Wayland code too.

src/init.c

@@ -140,6 +140,37 @@ static void terminate(void)
 //////                       GLFW internal API                      //////
 //////////////////////////////////////////////////////////////////////////
 
+// Encode a Unicode code point to a UTF-8 stream
+// Based on cutef8 by Jeff Bezanson (Public Domain)
+//
+size_t _glfwEncodeUTF8(char* s, unsigned int ch)
+{
+    size_t count = 0;
+
+    if (ch < 0x80)
+        s[count++] = (char) ch;
+    else if (ch < 0x800)
+    {
+        s[count++] = (ch >> 6) | 0xc0;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+    else if (ch < 0x10000)
+    {
+        s[count++] = (ch >> 12) | 0xe0;
+        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+    else if (ch < 0x110000)
+    {
+        s[count++] = (ch >> 18) | 0xf0;
+        s[count++] = ((ch >> 12) & 0x3f) | 0x80;
+        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
+        s[count++] = (ch & 0x3f) | 0x80;
+    }
+
+    return count;
+}
+
 char* _glfw_strdup(const char* source)
 {
     const size_t length = strlen(source);

src/internal.h

@@ -995,6 +995,8 @@ GLFWbool _glfwInitVulkan(int mode);
 void _glfwTerminateVulkan(void);
 const char* _glfwGetVulkanResultString(VkResult result);
 
+size_t _glfwEncodeUTF8(char* s, unsigned int ch);
+
 char* _glfw_strdup(const char* source);
 float _glfw_fminf(float a, float b);
 float _glfw_fmaxf(float a, float b);

src/x11_window.c

@@ -429,37 +429,6 @@ static char** parseUriList(char* text, int* count)
     return paths;
 }
 
-// Encode a Unicode code point to a UTF-8 stream
-// Based on cutef8 by Jeff Bezanson (Public Domain)
-//
-static size_t encodeUTF8(char* s, unsigned int ch)
-{
-    size_t count = 0;
-
-    if (ch < 0x80)
-        s[count++] = (char) ch;
-    else if (ch < 0x800)
-    {
-        s[count++] = (ch >> 6) | 0xc0;
-        s[count++] = (ch & 0x3f) | 0x80;
-    }
-    else if (ch < 0x10000)
-    {
-        s[count++] = (ch >> 12) | 0xe0;
-        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
-        s[count++] = (ch & 0x3f) | 0x80;
-    }
-    else if (ch < 0x110000)
-    {
-        s[count++] = (ch >> 18) | 0xf0;
-        s[count++] = ((ch >> 12) & 0x3f) | 0x80;
-        s[count++] = ((ch >> 6) & 0x3f) | 0x80;
-        s[count++] = (ch & 0x3f) | 0x80;
-    }
-
-    return count;
-}
-
 // Decode a Unicode code point from a UTF-8 stream
 // Based on cutef8 by Jeff Bezanson (Public Domain)
 //
@@ -497,7 +466,7 @@ static char* convertLatin1toUTF8(const char* source)
     char* tp = target;
 
     for (sp = source;  *sp;  sp++)
-        tp += encodeUTF8(tp, *sp);
+        tp += _glfwEncodeUTF8(tp, *sp);
 
     return target;
 }
@@ -2903,7 +2872,7 @@ const char* _glfwGetScancodeNameX11(int scancode)
     if (ch == -1)
         return NULL;
 
-    const size_t count = encodeUTF8(_glfw.x11.keynames[key], (unsigned int) ch);
+    const size_t count = _glfwEncodeUTF8(_glfw.x11.keynames[key], (unsigned int) ch);
     if (count == 0)
         return NULL;